Exposure to uncontrolled fire, not in building or structure (X01) ICD-10-CM
The X01 code range covers exposure to uncontrolled fire, not in building or structure with 21 ICD-10-CM diagnosis codes. 15 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Includes
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
- exposure to forest fire
7th Character Note
Certain ICD-10-CM categories have applicable 7th characters. The applicable 7th character is required for all codes within the category, or as the notes in the Tabular List instruct. The 7th character must always be the 7th character in the data field. If a code that requires a 7th character is not 6 characters, a placeholder X must be used to fill in the empty characters.
- The appropriate 7th character is to be added to each code from category X01
7th Character
Indicates that a seventh character is to be assigned to codes in a subcategory.
- A - initial encounter
- D - subsequent encounter
- S - sequela
Codes in the X01 Range 21 codes · 15 billable
- X01 Exposure to uncontrolled fire, not in building or structureNon-billable
- X01.0 Exposure to flames in uncontrolled fire, not in building or structureNon-billable
- X01.0XXA Exposure to flames in uncontrolled fire, not in building or structure, initial encounter
- X01.0XXD Exposure to flames in uncontrolled fire, not in building or structure, subsequent encounter
- X01.0XXS Exposure to flames in uncontrolled fire, not in building or structure, sequela
- X01.1 Exposure to smoke in uncontrolled fire, not in building or structureNon-billable
- X01.1XXA Exposure to smoke in uncontrolled fire, not in building or structure, initial encounter
- X01.1XXD Exposure to smoke in uncontrolled fire, not in building or structure, subsequent encounter
- X01.1XXS Exposure to smoke in uncontrolled fire, not in building or structure, sequela
- X01.3 Fall due to uncontrolled fire, not in building or structureNon-billable
- X01.3XXA Fall due to uncontrolled fire, not in building or structure, initial encounter
- X01.3XXD Fall due to uncontrolled fire, not in building or structure, subsequent encounter
- X01.3XXS Fall due to uncontrolled fire, not in building or structure, sequela
- X01.4 Hit by object due to uncontrolled fire, not in building or structureNon-billable
- X01.4XXA Hit by object due to uncontrolled fire, not in building or structure, initial encounter
- X01.4XXD Hit by object due to uncontrolled fire, not in building or structure, subsequent encounter
- X01.4XXS Hit by object due to uncontrolled fire, not in building or structure, sequela
- X01.8 Other exposure to uncontrolled fire, not in building or structureNon-billable
- X01.8XXA Other exposure to uncontrolled fire, not in building or structure, initial encounter
- X01.8XXD Other exposure to uncontrolled fire, not in building or structure, subsequent encounter
- X01.8XXS Other exposure to uncontrolled fire, not in building or structure, sequela
About the X01 Code Range
These codes describe exposure to an uncontrolled fire outside a building or structure. A wildfire is one example.
The subdivisions distinguish exposure to flames (X01.0) or smoke (X01.1), a fall (X01.3), being hit by an object (X01.4), and other exposure (X01.8). The seventh character distinguishes an initial encounter (A), a subsequent encounter (D), and a later effect (S, sequela).
Questions About This Page
How many billable codes are in the X01 range?
Of the 21 codes in this range, 15 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the X01 range classify?
The range classifies exposure to uncontrolled fire, not in building or structure. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
